PowerPoint hoses pictures in PDF output?

[Steven Rogers]

I have a PPT presentation that I printed out as a PDF and everything 
looks normal except for about 5 pictures that were originally JPEGs are 
just completely hosed up multi-colored squares. Its pretty large - 
about 65 pages and 70 MB with lots of images and linked movies. It 
looks fine on the screen.

I don't think its the pictures themselves. One of them appears twice in 
the presentation - one hosed, the other not. I was able to fix that by 
deleting the hosed one and replacing it with the good copy (I have the 
full version of Acrobat). But the others only appear once. I tried 
creating a PDF of just one page - still hosed. I tried creating a 
postscript file and running that through distiller - still hosed.

Anyone have any ideas what the cause might be, or how to fix it?

thanks,
Steve